I tend to read at night in bed, and, when I get sleepy, I understand each of the words on their own, but not in the context in which they are used; the meaning of what I am reading gets lost and my brain forgets what I had just read. It is kind of like experiencing the world while being drunk, since you understand what is happening with your body but can't control it.

Same here. Especially bad since I almost always read horror and weird fiction at night.

Not being a reader, but a postmodernist. 'How can i use this/apply this to my own work?' all the time when reading fiction.
Reading historical or non-fiction stuff only as location-scouting for works in progress.

"What can a thing do with a thing, when it is a thing?"
-Shaykh Ibn Al 'Arabi